JPH04322725A - Device for treating waste gas or the like - Google Patents

Abstract

PURPOSE:To increase the amt. of a waste gas to be treated and to miniaturize the device by providing a cylindrical fluidized-bed reactor with the inner peripheral surface as a distributing plate freely rotatably in an outer cylinder for introducing a gas to be treated and automatically supplying and exchanging the catalyst. CONSTITUTION:An engine is started to drive an exhaust pipe 7 through a reduction mechanism and a transmitting mechanism, a fluidized-bed reactor 1 is also rotated, and the catalyst 6 in the reactor 1 is held to the inner surface of a distributing plate 2 by the centrifugal force and fluidized. Meanwhile, the waste gas is introduced simultaneously with the start of the engine into the reactor from an inlet pipe 13 through an inlet outer cylinder 12 and the distributing plate 2 by the gas pressure and brought into contact with the catalyst. The catalyst 6 in the catalyst reservoir 9a of a catalyst supply pipe 9 is supplied to the fluidized bed by the centrifugal force through the supply passage 5a of a barrel 5, and the deteriorated and powdered catalyst 6 is sprung out of a discharge port 11 and recovered. Consequently, a high fluidizing gas linear velocity is obtained, the amt. of the waste gas to be treated is increased, and the waste gas is efficiently treated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating exhaust gas, etc.

0002

BACKGROUND OF THE INVENTION For example, denitrification and dust removal devices for removing nitrogen oxides (NOx) and soot contained in exhaust gas from diesel engines are known. This denitrification equipment passes exhaust gas through a catalyst-packed bed and generates nitrogen through a catalytic reaction.
This is a device that removes Ox. As this type of denitrification equipment, a fixed bed reactor and a gravity field fluidized bed reactor are known. (For example, see Japanese Patent Application Laid-Open No. 52-131970)

[0003] The former type of fixed bed reactor has problems such as the soot and dust contained in the exhaust gas clogging the reactor and significantly impeding treatment efficiency, and the need to replace the catalyst during operation if it deteriorates. There are issues such as not being able to do so.

[0004] The latter gravity field fluidized bed reactor has the disadvantage that it cannot respond to changes in the amount of exhaust gas due to changes in engine load. Since the area of the device must be increased, there is a problem that the device becomes larger.

The purpose of the present invention is to use a centrifugal fluidized bed reactor as a fluidized bed reactor to obtain a large linear velocity of fluidizing gas, increase the amount of exhaust gas processed, and downsize the entire device. It is an object of the present invention to provide a processing device for exhaust gas, etc., which can perform the denitrification reaction of exhaust gas with high efficiency by automatically supplying and discharging a deteriorated catalyst.

[0006]

[Means for Solving the Problems] The structure of the present invention, which solves the problems of the prior art, is that a cylindrical surface is used as a catalyst dispersion plate in an outer cylinder for introducing gas to be treated such as exhaust gas, and the central axis of this dispersion plate is A fluidized bed reactor with a cylindrical structure having a curved exhaust pipe on one side is rotatably provided, and a catalyst supply pipe coaxial with the exhaust pipe is connected to the other side of the fluidized bed reactor. A catalyst outlet is provided at a portion of the fluidized bed reactor remote from the supply pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, details of embodiments of the present invention will be explained with reference to the drawings. 1 is a longitudinal sectional front view, FIG. 2 is a longitudinal sectional front view of another embodiment, and FIG. 3 is a longitudinal sectional front view of an embodiment in which the dispersion plate is tapered.

To explain the configuration of the embodiment shown in FIG. 1, 1 has a cylindrical dispersion plate 2, and end plates 3 and
This is a fluidized bed reactor with a cylindrical structure formed by combining 4. A shaft cylinder 5 is fixed to the center of the one end plate 3,
A supply flow path 5a for the catalyst 6, which is orthogonal to the axis of the shaft cylinder 5, is integrally formed inside the shaft cylinder 5. Furthermore, one end of an exhaust pipe 7 whose axis coincides with the central axis of the shaft cylinder 5 is fixed to the center of the other end plate 4 . 8 in the diagram
is a filter having a cylindrical structure that is provided on the freeboard and has the same axis as the shaft tube 5 and exhaust pipe 7, and is designed to suppress the discharge of powdered catalyst 6 and dust.

Reference numeral 9 denotes a catalyst supply pipe connected to a hopper (not shown) of the catalyst 6, and a horizontal catalyst reservoir 9a is integrally formed in the lower part of the catalyst supply pipe 9. The shaft cylinder 5 is rotatably supported via a bearing 10. Further, a discharge port 11 for the catalyst 6 is provided on one side of the end plate 4 away from the supply flow path 5a for the catalyst 6. This outlet 11 is opened into the catalyst fluidized bed.

12 is larger in diameter than the fluidized bed reactor 1,
and the entire fluidized bed reactor 1 and a part of the exhaust pipe 7,
An exhaust gas introduction cylinder is formed to cover a part of the catalyst reservoir 9a, and on one side of the introduction cylinder 12 is an exhaust gas introduction pipe 13 that is directly connected to an exhaust pipe (not shown) of the engine. It is provided.

[0011] Further, in the introduction outer cylinder 12 on one end plate 4 side constituting the fluidized bed reactor 1, a catalyst discharge channel 15 is formed which is separated from the exhaust gas introduction side by a partition plate 14. , the exhaust port 1 of the catalyst 6 is connected to the catalyst exhaust flow path 15.
1 is connected. Bearings 16,
One side edge of the dispersion plate 2 and the base of the exhaust pipe 7 are rotatable via the support 17, that is, the fluidized bed reactor 1 is rotatably supported at three points relative to the introduction outer cylinder 12.

Furthermore, the exhaust gas introduction cylinder 12 and the fluidized bed reactor 1 are configured to be decomposable, so that the filter 8 can be replaced and the fluidized bed reactor 1 can be decomposed.
It goes without saying that maintenance such as cleaning should be possible. As a means for rotationally driving the fluidized bed reactor 1, a pulley (not shown) is provided on the exhaust pipe 7, and this is connected to the rotating shaft of the engine via a drive transmission mechanism or a deceleration mechanism. A rotation corresponding to the number is applied to the fluidized bed reactor 1.

Next, to explain the operation of the above embodiment, when the engine is started, its rotational drive drives the exhaust pipe 7 through the deceleration mechanism and the drive transmission mechanism, and also drives the fluidized bed reactor 1. Rotate. The catalyst 6 housed in the fluidized bed reactor 1 is caused to flow by centrifugal force so as to adhere to the inner surface of the dispersion plate 2. On the other hand, at the same time as the engine is started, the exhaust gas is transferred to the non-gas inlet pipe 13 into the inlet outer cylinder 12. The exhaust gas enters the interior through the dispersion plate 2 due to the gas pressure generated by the engine, and while flowing through the catalyst 6, the exhaust gas comes into contact with the catalyst and undergoes a reaction, for example, a denitrification reaction.

The exhaust gas purified by the denitrification reaction passes through the filter 8 and is discharged to the outside from the exhaust pipe 7. In addition, when the diameter of the hole in the dispersion plate 2 is made small to prevent dust (unburnt carbon) from clogging, the dust that is attached or about to adhere to the outer surface of the dispersion plate 2 can be removed using a scraper, although not particularly shown. The dust is scraped off and collected in a dust collection section provided at the bottom of the introduction outer cylinder 12. Furthermore, when relatively large-diameter holes are formed in the dispersion plate 2 to allow dust to pass through, the dust is collected in the fluidized bed, and the collected dust reacts with the exhaust gas, making it possible to denitrify the dust.

On the other hand, the catalyst 6 in the catalyst reservoir 9a of the catalyst supply pipe 9 is supplied to the fluidized bed via the supply channel 5a of the shaft cylinder 5 due to the action of centrifugal force. Further, the catalyst 6 which has deteriorated due to the reaction and has become powdered is protruded from the discharge port 11, and the catalyst discharge passage 15
It will be collected after.

In the embodiment shown in FIG. 2, a disk 18 having a diameter larger than the diameter of the shaft cylinder 5 is used instead of the catalyst supply channel 5a shown in FIG.
are arranged facing each other on a stay 19. With this configuration, the catalyst 6 flowing into the fluidized bed reactor 1 due to the action of centrifugal force is uniformly supplied in the circumferential direction. Components that are the same as those in the embodiment shown in FIG. 1 are designated by the same reference numerals, and a detailed explanation of the structure will be omitted. Further, since the operation is substantially the same as that in FIG. 1 except for a part, detailed explanation of the operation will be omitted.

The embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 1 in that the dispersion plate 2a is tapered so that the deteriorated powdered catalyst 6 can be efficiently discharged from the discharge port 11. This is what I did. Further, the same reference numerals are given to the same structural parts as in FIG. 1, and detailed explanation of the structure will be omitted. Furthermore, since the functions are substantially the same as those of the embodiment shown in FIG. 1 except for the function of the dispersion plate 2a, a detailed description of the functions will be omitted.

By selecting a catalyst, not only dust removal but also decomposition chemical reactions such as denitrification, desulfurization, and desalination can be performed.
Its fields of use are wide.

[0019]

According to the configuration of the present invention as described above, the following effects can be obtained. (a) By making the fluidized bed reactor rotatable in the exhaust gas atmosphere, the fluidized bed can be made into a centrifugal fluidized bed, and therefore, the linear velocity of the fluidizing gas is higher than that of a conventional fluidized bed in a gravity field. Since the amount of exhaust gas processed can be increased, the entire device can be made smaller and can be installed in automobiles, etc., and the problem of pollution caused by exhaust gas can be rationally solved. (b) By using the rotational power of the engine as a driving source before the fluidized bed reaction, the amount of exhaust gas depending on the engine speed can be efficiently processed. (c) Catalyst supply and exhaust replacement of deteriorated and powdered catalyst are automatically performed, and denitrification of exhaust gas in the reactor can be performed with high efficiency.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the device of the present invention.

FIG. 2 is a longitudinal sectional front view of another embodiment.

FIG. 3 is a longitudinal sectional front view of yet another embodiment.

[Explanation of symbols]

1 Fluidized bed reactor 2 Dispersion plate 2a Dispersion plate 3 End plate 4 End plate 5 Shaft tube 5a Supply channel 6 Catalyst 7 Exhaust pipe 9 Catalyst supply pipe 9a Catalyst reservoir 11 Discharge port 12 Exhaust gas introduction outer cylinder 13　Exhaust gas introduction pipe 14 Partition plate 15 Catalyst discharge flow path 18 Disc

Claims (1)

[Claims] Claim 1: A fluidized bed reactor having a cylindrical structure in which a cylindrical surface is used as a catalyst dispersion plate in an outer cylinder into which gas to be treated such as exhaust gas is introduced, and an exhaust pipe along the central axis of the dispersion plate is provided on one side. is rotatably driven, a catalyst supply pipe coaxial with the exhaust pipe is connected to the other side of the fluidized bed reactor, and a catalyst discharge port is connected to a part of the fluidized bed reactor separated from this catalyst supply pipe. A processing device for exhaust gas, etc., characterized by the following: